title: Effect of volume expansion and furosemide diuresis on the renal clearance of digoxin.
abstract: The effect of volume expansion with normal saline and 10% mannitol and increasing urine flow rate with furosemide on the fractional renal clearance of digoxin (CDIG/CIN) was studied in dogs given a constant infusion of digoxin of 0.010 micrograms/kg/min. With saline and mannitol volume expansion CDIG/CIN increased from 0.58 +/- 0.33 (S.D) and 0.54 +/- 0.14, respectively, to 1.28 +/- 0.14 and 1.13 +/- 0.22, respectively (P less than .005), as urine flow increased from 0.5 to 24 ml/min. With furosemide urine flow increased from 0.5 to 22 ml/min but CDIG/CIN remained constant at 0.63 +/- 0.18. We concluded that volume expansion but not urine flow rate substantially increases CDIG/CIN. We speculate that digoxin is at least partially, it not entirely, reabsorbed passively in the proximal tubule.
mesh_terms: D000818:Animals; D001826:Body Fluids / Q000502:physiology*; D004077:Digoxin / Q000378:metabolism*; D004285:Dogs; D005260:Female; D005665:Furosemide / Q000494:pharmacology*; D007328:Insulin; D007668:Kidney / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D008353:Mannitol / Q000494:pharmacology; D008657:Metabolic Clearance Rate / Q000187:drug effects; D012965:Sodium Chloride / Q000494:pharmacology
chemical_list: D007328:Insulin; D008353:Mannitol; D012965:Sodium Chloride; D004077:Digoxin; D005665:Furosemide